Good hair tonic for men and where to buy it in London, UK?

I recently tried hair tonic for the first time, and I preferred it to gel or wax.

Men who use ordinary/everyday hair tonic, what brand would you recommend? I've heard Vitalis is good. You can buy it from Amazon, but it costs £7, much more expensive than the $2 you can allegedly get it for in the US. I haven't been able to find hair tonic in any shops here in London. I guess it's quite old-fashioned. Where can I buy some good hair tonic here?

Updates:

I don't mean hair tonic for promoting hair growth. I mean old-fashioned hair tonic for styling: it has the same function as gel or wax essentially, but it's more subtle.